[Greenbuilding] Unifoam vs Plastispan
Lynelle Hamilton
lynelle at lahamilton.com
Tue Oct 3 23:42:44 CDT 2017
Thanks, John.
Frost protected shakkow foundation, yes. but not t a purchased "system"
for cost and delivery time issues. Am planning to construct my own, Soil
is a mixture of sand and sandy loam. Land around me is damp, although
the previous cottage had a crawl space that was dry. Those are the
concerns with regard to insulation. Because the perimeter (and a centre
"channel" that is to support an interior load bearing wall have to be
30psi, I will glue a 25 psi skirt around the perimeter, with additional
width at each corner.
Lynelle
On 2017-10-03 11:00 PM, John Salmen wrote:
>
> Depends on perimeter depth. Are you doing a frost protected
> foundation? Or are the footings below freezing and fully wrapped?
> consideration on the perimeter and bridging. I’ve typically gone R20
> on slab but R30 on perimeter.
>
> *From:*Greenbuilding
> [mailto:greenbuilding-bounces at lists.bioenergylists.org] *On Behalf Of
> *Lynelle Hamilton
> *Sent:* Tuesday, October 3, 2017 7:50 PM
> *To:* greenbuilding at lists.bioenergylists.org
> *Subject:* Re: [Greenbuilding] Unifoam vs Plastispan
>
> Norbert, is the 50F true when the slab is shallow (e.g. essentially on
> packed earth that is 16" below grade?
>
> Lynelle
>
> On 2017-10-03 7:19 PM, Norbert Senf wrote:
>
> Way high. If you do a payback analysis for the last R-10 it is
> close to infinite. Ground temperature around here is 50F, so your
> maximum differential is maybe 20 degrees ............... N
>
> On Tue, Oct 3, 2017 at 7:11 PM, Gennaro Brooks-Church - Eco
> Brooklyn <info at ecobrooklyn.com <mailto:info at ecobrooklyn.com>> wrote:
>
> R-35 under slab is high or low?
>
>
> Thanks!
>
> Gennaro
>
> On Tue, Oct 3, 2017 at 6:59 PM, John Straube <jfstraube at gmail.com
> <mailto:jfstraube at gmail.com>> wrote:
>
> I am not sure what is special about your slab, but standard XPS
> (25 psi max) has been used for decades. Hence, EPS with more than
> 25 psi seems odd anywhere except where a concentrated load
> occurs. Remember, 25 psi is 3500 psf, which is more than most
> soils can take. But to answer part of the question I have use
> PlastiFab EPS of wide range of strengths successfully for a long
> time, and have no experience with Uniform.
> Of course insulating with R-35 under slab seems very odd… the
> result of bizarre interior conditions or bizarre calculation methods?
>
> > On Oct 3, 2017, at 6:24 PM, Lynelle Hamilton <lynelle at lahamilton.com
> <mailto:lynelle at lahamilton.com>> wrote:
> >
> > I am insulating under a floating pad. The engineer has specified 25psi
> under the slab and 30 psi on outer edges. I've been looking at
> two products: Unifoam 25/30 and Plastifab 25/30. Aiming for R35
> under the slab. Price differential is significant (Unifoam is
> nearly $3000 more) for the house.
> >
> > Has anyone had experience with either product? From the specs,
> Unifoam appears to absorb less water and has less deflection, but
> both are within the ASTM spec for the issue.
> >
> > Many thanks for any insights!
> >
> > Lynelle Hamilton
> >
>
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> --
>
> Norbert Senf
> Masonry Stove Builders
> 25 Brouse Road, RR 5
> Shawville Québec J0X 2Y0
> 819.647.5092
> www.heatkit.com <http://www.heatkit.com>
>
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